From: Oliver Endriss <o.endriss@gmx.de>
To: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Mauro Carvalho Chehab <mchehab@infradead.org>,
Derek Kelly <user.vdr@gmail.com>,
"Hans J. Koch" <hjk@linutronix.de>, Jiri Kosina <jkosina@suse.cz>,
Ben Pfaff <blp@cs.stanford.edu>,
linux-media@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: Re: [patch] [media] av7110: wrong limiter in av7110_start_feed()
Date: Thu, 20 Oct 2011 23:39:31 +0000 [thread overview]
Message-ID: <201110210139.33912@orion.escape-edv.de> (raw)
In-Reply-To: <20111018061209.GF27732@elgon.mountain>
On Tuesday 18 October 2011 08:12:09 Dan Carpenter wrote:
> Smatch complains that the wrong limiter is used here:
> drivers/media/dvb/ttpci/av7110.c +906 dvb_feed_start_pid(12)
> error: buffer overflow 'npids' 5 <= 19
>
> Here is the problem code:
> 905 i = dvbdmxfeed->pes_type;
> 906 npids[i] = (pid[i]&0x8000) ? 0 : pid[i];
>
> "npids" is a 5 element array declared on the stack. If
> dvbdmxfeed->pes_type is more than 4 we probably put a (u16)0 past
> the end of the array.
>
> If dvbdmxfeed->pes_type is over 4 the rest of the function doesn't
> do anything. dvbdmxfeed->pes_type is capped at less than
> DMX_TS_PES_OTHER (20) in the caller function, but I changed it to
> less than or equal to DMX_TS_PES_PCR (4).
>
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
>
> diff --git a/drivers/media/dvb/ttpci/av7110.c b/drivers/media/dvb/ttpci/av7110.c
> index 3d20719..abf6b55 100644
> --- a/drivers/media/dvb/ttpci/av7110.c
> +++ b/drivers/media/dvb/ttpci/av7110.c
> @@ -991,7 +991,7 @@ static int av7110_start_feed(struct dvb_demux_feed *feed)
>
> if (feed->type = DMX_TYPE_TS) {
> if ((feed->ts_type & TS_DECODER) &&
> - (feed->pes_type < DMX_TS_PES_OTHER)) {
> + (feed->pes_type <= DMX_TS_PES_PCR)) {
> switch (demux->dmx.frontend->source) {
> case DMX_MEMORY_FE:
> if (feed->ts_type & TS_DECODER)
> --
> To unsubscribe from this list: send the line "unsubscribe linux-media" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
Acked-by: Oliver Endriss <o.endriss@gmx.de>
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prev parent reply other threads:[~2011-10-20 23:39 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-18 6:12 [patch] [media] av7110: wrong limiter in av7110_start_feed() Dan Carpenter
2011-10-20 23:39 ` Oliver Endriss [this message]
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